That's what you deserve. Trading a Pokémon you can get in both versions, honestly... Wonder Trade isn't exactly a reliable place for good Pokémon unless you just started your game, then you end up with a team of level 40s at the first route. --- GTS is evil.
You're not supposed to wonder trade irreplaceable pokemon that you don't want to lose, as what you give has no effect on what you get. Best thing to wonder trade is if you have boxes full of breeding rejects.